[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.222536] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 29.707992] random: sshd: uninitialized urandom read (32 bytes read) [ 30.150297] random: sshd: uninitialized urandom read (32 bytes read) [ 30.636344] random: sshd: uninitialized urandom read (32 bytes read) [ 30.770841] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.21' (ECDSA) to the list of known hosts. [ 36.255101] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 36.334575] BUG: unable to handle kernel paging request at ffffeafff9090020 [ 36.341911] IP: [] page_remove_rmap+0x37/0x6d0 [ 36.348158] PGD 0 [ 36.350108] [ 36.351733] Oops: 0000 [#1] PREEMPT SMP KASAN [ 36.356202] Dumping ftrace buffer: [ 36.359724] (ftrace buffer empty) [ 36.363411] Modules linked in: [ 36.366696] CPU: 1 PID: 3794 Comm: syz-executor099 Not tainted 4.9.122-g54068d6 #26 [ 36.374501] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.383837] task: ffff8801b9a13000 task.stack: ffff8801d9530000 [ 36.389867] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 36.398540] RSP: 0018:ffff8801d9537948 EFLAGS: 00010246 [ 36.403964] RAX: dffffc0000000000 RBX: ffffeafff9090000 RCX: ffffea0006f40000 [ 36.411206] RDX: 1ffffd5fff212004 RSI: ffffffff814f5918 RDI: ffffeafff9090000 [ 36.418451] RBP: ffff8801d9537970 R08: 0000000000033960 R09: 0000000000000001 [ 36.425695] R10: ffff8801b9a13000 R11: 0000000000000001 R12: ffff8801d9537c08 [ 36.432947] R13: ffffeafff9090020 R14: ffffeafff9090000 R15: 0000000000000001 [ 36.440269] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 36.448476] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.454334] CR2: ffffeafff9090020 CR3: 00000001c5ee8000 CR4: 00000000001606f0 [ 36.461579] Stack: [ 36.463706] ffffeafff9090020 ffff8801d9537c08 ffff8801c5ede800 ffffeafff9090000 [ 36.471690] ffff8801c28ca738 ffff8801d95379c8 ffffffff8154cb8f ffff8801d9537c18 [ 36.479675] ffff8801d9537c10 ffff8801d9537c88 00003ffe424001e0 00000001c5ede000 [ 36.487659] Call Trace: [ 36.490223] [] zap_huge_pmd+0x16f/0x860 [ 36.495828] [] unmap_page_range+0x12ad/0x1730 [ 36.501948] [] ? vm_normal_page_pmd+0x310/0x310 [ 36.508246] [] unmap_single_vma+0x101/0x260 [ 36.514196] [] unmap_vmas+0x102/0x1d0 [ 36.519623] [] exit_mmap+0x214/0x3f0 [ 36.524962] [] ? SyS_munmap+0xa0/0xa0 [ 36.530397] [] ? up_write+0x1a/0x60 [ 36.535654] [] mmput+0xf3/0x2d0 [ 36.540559] [] do_exit+0x906/0x27b0 [ 36.545813] [] ? release_task.part.19+0x1210/0x1210 [ 36.552453] [] ? up_write+0x1a/0x60 [ 36.557716] [] ? do_mprotect_pkey+0x71d/0x890 [ 36.563841] [] ? mprotect_fixup+0x930/0x930 [ 36.569794] [] do_group_exit+0x111/0x340 [ 36.575484] [] ? do_group_exit+0x340/0x340 [ 36.581343] [] SyS_exit_group+0x1d/0x20 [ 36.586944] [] do_syscall_64+0x1a6/0x490 [ 36.592634] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 36.599597] Code: 55 41 54 53 48 89 fb e8 58 b4 e6 ff 4c 8d 6b 20 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 00 0f 85 b8 05 00 00 <4c> 8b 73 20 49 89 dc 41 f6 c6 01 0f 85 4b 03 00 00 e8 23 b4 e6 [ 36.626791] RIP [] page_remove_rmap+0x37/0x6d0 [ 36.633124] RSP [ 36.636724] CR2: ffffeafff9090020 [ 36.640154] ---[ end trace 33c615881c59df2b ]--- [ 36.644885] Kernel panic - not syncing: Fatal exception [ 36.650595] Dumping ftrace buffer: [ 36.654117] (ftrace buffer empty) [ 36.657801] Kernel Offset: disabled [ 36.661402] Rebooting in 86400 seconds..